<template>
  <div class="login_container">
    <div class="login_box">
<!--      头像区-->
      <div class="avatar_box">
        <img src="../assets/img/logo.png" alt="">
      </div>
<!--      登录表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login-form">
<!--      用户名-->
      <el-form-item prop="username">
        <el-input v-model="loginForm.username" prefix-icon="el-icon-search"></el-input>
      </el-form-item>
<!--      密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-search"></el-input>
        </el-form-item>
<!--        按钮区域-->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    data(){
      return {
        // 登录表单的数据绑定对象
        loginForm:{
          username:'admin',
          password:'123456'
        },
        //表单的验证规则对象
        loginFormRules:{
          //验证用户名是否合法
          username:[
              {required: true,message:"请输入用户名", trigger: 'blur'},
              {min: 3,max: 10,message:"长度在3到10个字符" ,trigger: "blur"}
              ],
          //验证密码是否合法
          password:[
            {required: true,message:"请输入密码", trigger: 'blur'},
            {min: 6,max: 15,message:"长度在6到15个字符" ,trigger: "blur"}
          ]
        }
      }
    },
    methods:{
      //点击重置按钮,重置登录表单
      resetLoginForm(){
        this.$refs.loginFormRef.resetFields();
      },
      login(){
        this.$refs.loginFormRef.validate(async (valid) => {
          if (!valid) return;
          const { data: res} = await this.$http.post("login",this.loginForm);
          if(res.meta.status !== 200) return this.$message.error('登录失败!')
          this.$message.success('登录成功!')

          //1.将登录成功之后的token，保存到客服端的sessionStorage中
          //1.1 项目中出了登录之外的其他API接口，必须在登录之后才能访问
          //1.2 token只能在当前网站打开期间生效，所以将token保存在sessionStorage中
          window.sessionStorage.setItem("token", res.data.token);
          //2.通过编程式导航跳转到后台主页，路由地址是/home
          this.$router.push("/home")
        });
      }
    }
  }
</script>

<style lang="less" scoped>
  //lang="less"代表支持less语法格式  scoped代表仅在该文件下生效，若没有scoped则代表全局生效
.login_container {
  background-color:#E89B29;
  height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #E6E61A;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50% , -50%);

  //语法嵌套
  .avatar_box{
    width: 130px;
    height: 130px;
    border:1px solid yellow;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px aquamarine;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: aquamarine;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: aquamarine;
    }
  }
}

.btns {
  display: flex;
  justify-content: flex-end;
}

  .login-form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing:border-box;
  }

</style>
